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Number of preprimes of the third kind (A247394) with the smallest prime divisor equals prime(n).
5

%I #15 Dec 23 2024 14:53:44

%S 12,12,3,4,2,3,4,1,4,1,1,2,3,4,1,4,2,1,2,2,4,5,0,0,1,0,0,5,3,2,2,5,1,

%T 2,2,2,2,2,1,4,0,1,0,4,6,2,0,2,2,1,4,2,3,3,1,2,1,1,2,5,1,1,0,4,2,4,1,

%U 1,1,3,2,2,1,2,2,1,2,3,1,3,0,2,1,3,3,1

%N Number of preprimes of the third kind (A247394) with the smallest prime divisor equals prime(n).

%H Vladimir Shevelev, <a href="https://web.archive.org/web/*/http://list.seqfan.eu/oldermail/seqfan/2014-September/013643.html">A classification of the positive integers over primes</a>

%Y Cf. A000040, A156759, A247393, A247394, A247509, A247510, A247606.

%K nonn

%O 1,1

%A _Vladimir Shevelev_, Sep 18 2014

%E More terms from _Peter J. C. Moses_, Sep 18 2014